For those who only talk about luck, check this out:

https://sports.vice.com/en_uk/article/the-life-of-a-professional-gambler

Unless it's a fake, there might be more than luck in gambling...

EDIT: quoted from the article:

I developed a programme myself that works completely off of mathematics. My bets have nothing to do with luck. I never leave anything up to a gut feeling, it's all about my calculations.